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1639–40 in R. Renwick Gleanings from Rec. Royal Burgh Peebles (1912) 251 For twa faddom towes to beir up the rocking-trie of the auld milne.

?1790 R. Sandilands Descr. Patent Instrument called Sward-cutter 3 A cylinder or segment of wood,..called a rocking tree, which goes across the frame, and moves on the pivots fixed into it.

1829 E. Galloway Hist. & Progr. Steam Engine 449 If a be connected to a rocking bar a e, which from its length, or its small angular motion, describes an arc g a, differing but little from a right line.

1836 L. Herbert Engineer's & Mechanic's Encycl. II. 260 An arrangement..by which the alternating rectilinear motion of the piston rod is made to work harmoniously with the alternating curvilinear motion of a rocking beam.

1841 Civil Engineer & Architect's Jrnl. 4 187/2 A double lever on the rocking-shaft for working the valve.

1881 F. J. Britten Watch & Clockmakers' Handbk. (ed. 4) 71 Three wheels gearing together are planted on the rocking bar.

1912 J. W. Wayland Hist. Rockingham County xxi. 384 The heavy batten..hung by two side bars and swung from an axle, or ‘rocking-tree’, at the top of the loom.

1935 Discovery Apr. 119/1 A rocking beam is usually brought into operation when it is required to drill to depths below 700 feet.

1963 A. Bird & F. Hutton-Stott Veteran Motor Car Pocketbk. 115 The Gobron engines differed from the Arrol-Johnston..in doing without the rocking-lever linkage.

1972 H. Catling in D. T. Jenkins & K. G. Ponting Wool Textile Industry Great Brit. viii. 109/2 The left [hand] was used to guide the yarn to the package by means of a rocking shaft.

2000 P. W. B. Semmens & A. J. Goldfinch How Steam Locomotives really Work iv. 133 A few of Bowen-Cooke's ‘Prince of Wales’ 4-6-0s were fitted with outside valve-gear which drove the inside valves by means of rocking-levers.